drivers/crypto/nx/nx-sha512.c

   1 /**
   2  * SHA-512 routines supporting the Power 7+ Nest Accelerators driver
   3  *
   4  * Copyright (C) 2011-2012 International Business Machines Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 only.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * Author: Kent Yoder <yoder1@us.ibm.com>
  20  */
  21
  22 #include <crypto/internal/hash.h>
  23 #include <crypto/sha.h>
  24 #include <linux/module.h>
  25 #include <asm/vio.h>
  26
  27 #include "nx_csbcpb.h"
  28 #include "nx.h"
  29
  30
  31 static int nx_sha512_init(struct shash_desc *desc)
  32 {
  33         struct sha512_state *sctx = shash_desc_ctx(desc);
  34         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
  35         struct nx_sg *out_sg;
  36
  37         nx_ctx_init(nx_ctx, HCOP_FC_SHA);
  38
  39         memset(sctx, 0, sizeof *sctx);
  40
  41         nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA512];
  42
  43         NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA512);
  44         out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
  45                                   SHA512_DIGEST_SIZE, nx_ctx->ap->sglen);
  46         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
  47
  48         return 0;
  49 }
  50
  51 static int nx_sha512_update(struct shash_desc *desc, const u8 *data,
  52                             unsigned int len)
  53 {
  54         struct sha512_state *sctx = shash_desc_ctx(desc);
  55         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
  56         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
  57         struct nx_sg *in_sg;
  58         u64 to_process, leftover, spbc_bits;
  59         int rc = 0;
  60
  61         if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
  62                 /* we've hit the nx chip previously and we're updating again,
  63                  * so copy over the partial digest */
  64                 memcpy(csbcpb->cpb.sha512.input_partial_digest,
  65                        csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
  66         }
  67
  68         /* 2 cases for total data len:
  69          *  1: <= SHA512_BLOCK_SIZE: copy into state, return 0
  70          *  2: > SHA512_BLOCK_SIZE: process X blocks, copy in leftover
  71          */
  72         if ((u64)len + sctx->count[0] < SHA512_BLOCK_SIZE) {
  73                 memcpy(sctx->buf + sctx->count[0], data, len);
  74                 sctx->count[0] += len;
  75                 goto out;
  76         }
  77
  78         /* to_process: the SHA512_BLOCK_SIZE data chunk to process in this
  79          * update */
  80         to_process = (sctx->count[0] + len) & ~(SHA512_BLOCK_SIZE - 1);
  81         leftover = (sctx->count[0] + len) & (SHA512_BLOCK_SIZE - 1);
  82
  83         if (sctx->count[0]) {
  84                 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
  85                                          sctx->count[0], nx_ctx->ap->sglen);
  86                 in_sg = nx_build_sg_list(in_sg, (u8 *)data,
  87                                          to_process - sctx->count[0],
  88                                          nx_ctx->ap->sglen);
  89                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
  90                                         sizeof(struct nx_sg);
  91         } else {
  92                 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)data,
  93                                          to_process, nx_ctx->ap->sglen);
  94                 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
  95                                         sizeof(struct nx_sg);
  96         }
  97
  98         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
  99
 100         if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
 101                 rc = -EINVAL;
 102                 goto out;
 103         }
 104
 105         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 106                            desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 107         if (rc)
 108                 goto out;
 109
 110         atomic_inc(&(nx_ctx->stats->sha512_ops));
 111
 112         /* copy the leftover back into the state struct */
 113         if (leftover)
 114                 memcpy(sctx->buf, data + len - leftover, leftover);
 115         sctx->count[0] = leftover;
 116
 117         spbc_bits = csbcpb->cpb.sha512.spbc * 8;
 118         csbcpb->cpb.sha512.message_bit_length_lo += spbc_bits;
 119         if (csbcpb->cpb.sha512.message_bit_length_lo < spbc_bits)
 120                 csbcpb->cpb.sha512.message_bit_length_hi++;
 121
 122         /* everything after the first update is continuation */
 123         NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 124 out:
 125         return rc;
 126 }
 127
 128 static int nx_sha512_final(struct shash_desc *desc, u8 *out)
 129 {
 130         struct sha512_state *sctx = shash_desc_ctx(desc);
 131         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 132         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 133         struct nx_sg *in_sg, *out_sg;
 134         u64 count0;
 135         int rc;
 136
 137         if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
 138                 /* we've hit the nx chip previously, now we're finalizing,
 139                  * so copy over the partial digest */
 140                 memcpy(csbcpb->cpb.sha512.input_partial_digest,
 141                        csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 142         }
 143
 144         /* final is represented by continuing the operation and indicating that
 145          * this is not an intermediate operation */
 146         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 147
 148         count0 = sctx->count[0] * 8;
 149
 150         csbcpb->cpb.sha512.message_bit_length_lo += count0;
 151         if (csbcpb->cpb.sha512.message_bit_length_lo < count0)
 152                 csbcpb->cpb.sha512.message_bit_length_hi++;
 153
 154         in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buf, sctx->count[0],
 155                                  nx_ctx->ap->sglen);
 156         out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA512_DIGEST_SIZE,
 157                                   nx_ctx->ap->sglen);
 158         nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 159         nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
 160
 161         if (!nx_ctx->op.outlen) {
 162                 rc = -EINVAL;
 163                 goto out;
 164         }
 165
 166         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 167                            desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 168         if (rc)
 169                 goto out;
 170
 171         atomic_inc(&(nx_ctx->stats->sha512_ops));
 172         atomic64_add(csbcpb->cpb.sha512.message_bit_length_lo / 8,
 173                      &(nx_ctx->stats->sha512_bytes));
 174
 175         memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
 176 out:
 177         return rc;
 178 }
 179
 180 static int nx_sha512_export(struct shash_desc *desc, void *out)
 181 {
 182         struct sha512_state *sctx = shash_desc_ctx(desc);
 183         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 184         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 185         struct sha512_state *octx = out;
 186
 187         /* move message_bit_length (128 bits) into count and convert its value
 188          * to bytes */
 189         octx->count[0] = csbcpb->cpb.sha512.message_bit_length_lo >> 3 |
 190                          ((csbcpb->cpb.sha512.message_bit_length_hi & 7) << 61);
 191         octx->count[1] = csbcpb->cpb.sha512.message_bit_length_hi >> 3;
 192
 193         octx->count[0] += sctx->count[0];
 194         if (octx->count[0] < sctx->count[0])
 195                 octx->count[1]++;
 196
 197         memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
 198
 199         /* if no data has been processed yet, we need to export SHA512's
 200          * initial data, in case this context gets imported into a software
 201          * context */
 202         if (csbcpb->cpb.sha512.message_bit_length_hi ||
 203             csbcpb->cpb.sha512.message_bit_length_lo)
 204                 memcpy(octx->state, csbcpb->cpb.sha512.message_digest,
 205                        SHA512_DIGEST_SIZE);
 206         else {
 207                 octx->state[0] = SHA512_H0;
 208                 octx->state[1] = SHA512_H1;
 209                 octx->state[2] = SHA512_H2;
 210                 octx->state[3] = SHA512_H3;
 211                 octx->state[4] = SHA512_H4;
 212                 octx->state[5] = SHA512_H5;
 213                 octx->state[6] = SHA512_H6;
 214                 octx->state[7] = SHA512_H7;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int nx_sha512_import(struct shash_desc *desc, const void *in)
 221 {
 222         struct sha512_state *sctx = shash_desc_ctx(desc);
 223         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 224         struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 225         const struct sha512_state *ictx = in;
 226
 227         memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
 228         sctx->count[0] = ictx->count[0] & 0x3f;
 229         csbcpb->cpb.sha512.message_bit_length_lo = (ictx->count[0] & ~0x3f)
 230                                                         << 3;
 231         csbcpb->cpb.sha512.message_bit_length_hi = ictx->count[1] << 3 |
 232                                                    ictx->count[0] >> 61;
 233
 234         if (csbcpb->cpb.sha512.message_bit_length_hi ||
 235             csbcpb->cpb.sha512.message_bit_length_lo) {
 236                 memcpy(csbcpb->cpb.sha512.message_digest, ictx->state,
 237                        SHA512_DIGEST_SIZE);
 238
 239                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 240                 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 241         }
 242
 243         return 0;
 244 }
 245
 246 struct shash_alg nx_shash_sha512_alg = {
 247         .digestsize = SHA512_DIGEST_SIZE,
 248         .init       = nx_sha512_init,
 249         .update     = nx_sha512_update,
 250         .final      = nx_sha512_final,
 251         .export     = nx_sha512_export,
 252         .import     = nx_sha512_import,
 253         .descsize   = sizeof(struct sha512_state),
 254         .statesize  = sizeof(struct sha512_state),
 255         .base       = {
 256                 .cra_name        = "sha512",
 257                 .cra_driver_name = "sha512-nx",
 258                 .cra_priority    = 300,
 259                 .cra_flags       = CRYPTO_ALG_TYPE_SHASH,
 260                 .cra_blocksize   = SHA512_BLOCK_SIZE,
 261                 .cra_module      = THIS_MODULE,
 262                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 263                 .cra_init        = nx_crypto_ctx_sha_init,
 264                 .cra_exit        = nx_crypto_ctx_exit,
 265         }
 266 };